SYSCAL System calibration.

Name

Format

Units

Measure

Comments

Columns

Key

ANTENNA_ID

Int Antenna identifier

FEED_ID

Int Feed identifier

SPECTRAL_WINDOW_ID

Int Spectral window identifier

TIME

Double s EPOCH Mid-point of time for which the set of parameters is accurate

INTERVAL

Double s Time interval

Data

NUM_LOAD

Int number Ncl of NCAL or TLOAD used

CALLOAD

Int( Ncl) List of the Ncl LOADs used

FEFF

Float( Nr) Forward efficiency

AEFF

Float( Nr) Aperture efficiency

PHASE_DIFF

Float rad Phase difference between receptor 0 and receptor 1

SBGAIN

Float Relative gain of LO1 sideband

TAU

Float( Nr) K Atmosheric optical depth

TCAL

Float( Nr) K Calibration temperature

TRX

Float( Nr) K Receiver temperature

TSKY

Float( Nr) K Sky temperature

TSYS

Float( Nr) K System temperature

TANT

Float( Nr) K Antenna temperature

TANT_TSYS

Float( Nr) Tant/Tsys

PWVPATH

Float( Nr) m Water vapor pathlength

DPWVPATH

Float( Nr) m K-1 Pathlength per K of radiometric emission

FEFF_SPECTRUM

Float( Nr, Nf) Forward efficiency spectrum

SBGAIN_SPECTRUM

Float( Nr, Nf) Relative gain spectrum

TAU_SPECTRUM

Float( Nr, Nf) Atmosheric optical depth spectrum

TCAL_SPECTRUM

Float( Nr, Nf) K Calibration temperature spectrum

TRX_SPECTRUM

Float( Nf) K Receiver temperature spectrum

TSKY_SPECTRUM

Float( Nr, Nf) Sky temperature spectrum

TSYS_SPECTRUM

Float( Nr, Nf) K System temperature spectrum

TANT_SPECTRUM

Float( Nr, Nf) K Antenna temperature spectrum

TANT_TSYS_SPECTRUM

Float( Nr, Nf) Tant/Tsys spectrum

PWVPATH_SPECTRUM

Float( Nf) m Water vapor pathlength spectrum

DPWVPATH_SPECTRUM

Float( Nf) m K-1 Pathlength increment spectrum

NUM_POLY

Int Series order Npoly

NUM_POLY_FREQ

Int Freq. series order Npolyf

TIME_ORIGIN

Double s EPOCH Origin for the polynomial

FREQ_ORIGIN

Double Hz FREQUENCY Origin of frequency expansion

PHASE_CURVE

Float( Nr, Npoly) rad Phase polynomial coeff.

DELAY_CURVE

Float( Nr, Npoly) s Delay polynomial coeff.

AMPLI_CURVE

Float( Nr, Npoly) Jy K-1 Amplitude polynomial coeff.

BANDPASS_CURVE

Float( Nr, Npolyf) Bandpass polynomial coeff.

Flags

PHASEDIFF_FLAG

Bool Flag for PHASEDIFF

SBGAIN_FLAG

Bool Flag for SBGAIN

TAU_FLAG

Bool Flag for TAU

TCAL_FLAG

Bool Flag for TCAL

TRX_FLAG

Bool Flag for TRX

TSKY_FLAG

Bool Flag for TSYS

TSYS_FLAG

Bool Flag for TSYS

TANT_FLAG

Bool Flag for TANT

TANT_TSYS_FLAG

Bool Flag for Tant/Tsys

PWVPATH_FLAG

Bool Flag for PWVPATH

Notes: This table contains time-variable calibration measurements for each antenna, as indexed on feed and spectral window. Nr is the number of receptors and Nf the number of frequency channels.
Note that all the items in the data section are optional. However, at least one non-key item must be specified for a given row in this table.
ANTENNA_ID
Antenna identifier, as indexed from an element in the ANTENNA_ARRAY collection in the CONFIG_DESCRIPTION table.
FEED_ID
Feed identifier, as indexed from an element in the FEED_LISTcollection in the the CONFIG_DESCRIPTION table.
SPECTRAL_WINDOW_ID
Spectral window identifier. In general this will be associated to spectral window identifiers corresponding to low spectral resolutions. .
TIME
Mid-point of the time interval over which the data in the row are valid. Require to use the same TIME Measure reference as in MAIN
INTERVAL
Time interval
NUM_LOAD
Number of loads Ncl used for this calibration. (e.g. 2 for the determination of TRX using a a cold and a hot load, 1 for determination of TCAL, a hot load when using the chopper wheel method, ...)
CALLOAD
List of the Ncl loads used for this calibration. (e.g. 2 for the determination of TRX using a a cold and a hot load, 1 for determination of TCAL, a hot load when using the chopper wheel method, ...)
FEFF
Fraction of the beam volume looking at the sky.  
AEFF
Aperture efficiency.  
PHASE_DIFF
Phase difference between receptor 0 and receptor 1.
SBGAIN
Sideband gain spectrum. Actual normalization to be defined.
TAU
Average opacity
TCAL
Calibration temperature (temperature used to convert the raw signals to Ta* scale.)  
TRX
Receiver temperature.  
TSKY
Sky temperature  
TSYS
System temperature  
TANT
Antenna temperature
TANT_TSYS
Antenna temperature over system temperature
PWVPATH
Water vapor pathlength  
DPWVPATH
Water vapor pathlength increment per K of radiometric emission  
FEFF_SPECTRUM
Fraction of the beam volume spectrum.  
SBGAIN_SPECTRUM
Sideband gain spectrum. The other SPECTRAL_WINDOW_IDfor the other sideband is know via ASSOC_SPW_ID 
TAU_SPECTRUM
Opacity spectrum
TCAL_SPECTRUM
  Temperature used to convert the raw signals to Ta* scale
TRX_SPECTRUM
Receiver temperature spectrum. Frequency dependency mandatory for ALMA  
TSKY_SPECTRUM
Sky temperature spectrum  
TSYS_SPECTRUM
System temperature spectrum  
TANT_SPECTRUM
Antenna temperature spectrum    
TANT_TSYS_SPECTRUM
Antenna temperature over system temperature spectrum
PWVPATH_SPECTRUM
Water vapor pathlength spectrum
DPWVPATH_SPECTRUM
Water vapor pathlength increment spectrum per K of radiometric emission
TAU_SPECTRUM
Atmosheric optical depth spectrum
NUM_POLY
Series order Npoly
NUM_POLY_FREQ
Frequencies series order Npolyf
TIME_ORIGIN
Origin of time expansion
FREQ_ORIGIN
Origin of frequency expansion
PHASE_CURVE
Provisional Phase polynomial coefficients
DELAY_CURVE
Provisional Delay polynomial coefficients
AMPLI_CURVE
Provisional Amplitude polynomial coefficients
BANDPASS_CURVE
Provisional bandpass polynomial coefficients
PHASEDIFF_FLAG
True if PHASE_DIFF flagged
PHASEDIFF_FLAG
True if PHASE_DIFF flagged
SBGAIN_FLAG
True if SBGAIN flagged
TAU_FLAG
True if TAU flagged
TCAL_FLAG
True if TCAL flagged
TRX_FLAG
True if TRX flagged
TSKY_FLAG
True if TSKY flagged
TSYS_FLAG
True if TSYS flagged
TANT_FLAG
True if TANT flagged
TANT_TSYS_FLAG
True if TANT_TSYS flagged
PWVPATH_FLAG
True if PWVPATH flagged